Fortey, R., Landing, E., Skevington, D., 1982. Cambrian-Ordovician Boundary Sections in the Cow Head Group, Western Newfoundland, in: Bassett, M., Dean, W. (Eds.), The Cambrian-Ordovician Boundary: Sections, Fossil Distributions, and CorrelationsNational Museum of Wales. pp. 95-129.